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Rolling bearing unit with combination seal ring

a technology of combination seal and rolling bearing, which is applied in the direction of mechanical equipment, instruments, transportation and packaging, etc., can solve the problems of increasing the number of components, increasing the cost, and limiting the clearance dimension, so as to ensure the durability of the roll bearing unit, the effect of preventing foreign matter and satisfactory sealing performan

Inactive Publication Date: 2017-01-03
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively prevents foreign matters from permeating the seal internal space, reduces drag torque, and ensures durable sealing performance over a long period by minimizing the accumulation of solid materials on the seal lips, thus enhancing the durability of the rolling bearing unit.

Problems solved by technology

However, there is a limit in decreasing the clearance dimension.
However, the number of components is increased and the cost is increased.
In addition, there is a possibility that an installation space for disposing the second seal ring is increased and design freedom may be limited in order to prevent interference with other articles disposed adjacent to the rolling bearing unit with the combination seal ring.
Therefore, there is a disadvantage in that a sliding contact portion is increased and drag torque (rotational dynamic torque) is increased.

Method used

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  • Rolling bearing unit with combination seal ring
  • Rolling bearing unit with combination seal ring
  • Rolling bearing unit with combination seal ring

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0068][First Embodiment]

[0069]FIG. 1 illustrates a first embodiment of the present invention. A characteristic of a rolling bearing unit with a combination seal ring of the present invention including the present embodiment is a structure for satisfactorily maintaining sealing performance of the combination seal ring for a long period of time in such a manner that in addition to multiple seal lips disposed in an elastic member, an auxiliary seal lip whose rigidity is lower than that of respective seal lips is disposed in the elastic member configuring the seal ring so as to prevent foreign matters from permeating a seal internal space of the combination seal ring and so as to prevent the foreign matters from adhering to a seal lip close to an external space within the respective seal lips. A configuration and an operation of the other portions are the same as those of various rolling bearing units which have been known in the related art in order to rotatably support wheels with res...

second embodiment

[0089][Second Embodiment]

[0090]FIG. 3 illustrates a second embodiment. In a case of the present embodiment, an encoder 25a made of a permanent magnet which is formed in an overall annular shape by dispersing magnetic powder in a high polymer material such as rubber and synthetic resin is fixedly attached to an inboard side surface of the rotary side annular portion 19 configuring the slinger 16 over the entire periphery. The encoder 25a is formed so as to cover a distal end side peripheral edge (outer peripheral edge) of the rotary side annular portion 19, and configures the labyrinth seal 27a between the encoder 25a and (a portion of the elastic member 21a covered by) the inner peripheral surface of the stationary side cylindrical portion 23 configuring the metal insert 20a of the seal ring 17a. In addition, as an elastomer configuring the elastic member 21a of the seal ring 17a, those which contain a wax component and have excellent water repellency are used.

[0091]According to the...

third embodiment

[0093][Third Embodiment]

[0094]FIG. 4 illustrates a third embodiment of the present embodiment. In a case of the present embodiment, an encoder 25b made of a permanent magnet is also fixedly attached to the inboard side surface of the rotary side annular portion 19 configuring the slinger 16 over the entire periphery. In a case of the present embodiment, an annular projection 36 is formed by causing a portion of the high polymer material configuring the encoder 25b to cross over the outer peripheral edge of the rotary side annular portion 19 and to project toward the stationary side annular portion 24 configuring the metal insert 20a of the seal ring 17a over the entire periphery. The inner peripheral surface of the projection 36 is a tilted surface 37 having a partially conical surface shape, which is tilted in a direction where the inner diameter increases as it goes toward the distal end side (as it goes outboard). Then, a labyrinth seal 27b is provided by including a portion betw...

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PUM

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Abstract

A structure which ensures a movement of a seal lip disposed in a seal lip is realized by preventing foreign matters from permeating a seal internal space between a slinger and a seal ring. A labyrinth seal is disposed between an outer peripheral edge of a rotary side annular portion configuring the slinger and an inner peripheral surface of a stationary side cylindrical portion of a metal insert configuring the seal ring. In addition, a thickened portion is formed in a portion of an elastic member configuring the seal ring over an entire periphery. An auxiliary seal lip whose rigidity is lower than that of respective seal lips is disposed in the thickened portion over the entire periphery. The auxiliary seal lip prevents the foreign matters from adhering to the seal lip, and prevents the movement of the seal lip from being hindered.

Description

TECHNICAL FIELD[0001]The present invention relates to an improvement in a rolling bearing unit with a combination seal ring which is configured so that the combination seal ring formed of a slinger and a seal ring closes an end portion opening of a bearing internal space which is present between peripheral surfaces where a rotary side race ring and a stationary side race ring oppose each other and in which multiple rolling elements are installed, for example, out of rolling bearing units for rotatably supporting wheels of a vehicle with respect to a suspension device. Specifically, the present invention aims to realize a structure which can satisfactorily maintain sealing performance using the combination seal ring over a long period of time by reducing an amount of foreign matters permeating a seal internal space which is present between the slinger and the seal ring.BACKGROUND ART[0002]As a rolling bearing unit for rotatably supporting wheels of a vehicle with respect to a suspens...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16C33/80F16C41/00G01P3/42F16C33/78G01P3/44F16J15/32F16C33/76F16C19/18F16J15/3232F16J15/3236F16J15/326F16J15/447
CPCF16C33/805F16C33/768F16C33/7823F16C33/7883F16C41/007F16J15/3264G01P3/443F16C19/186F16C2326/02
Inventor TAKAYAMA, AKINOBUSHIONO, YASUHIROWATANABE, MASAMITSUTANAHASHI, MASAYOSHISAKODA, HIRONARI
Owner NSK LTD